diff --git a/spec/factories/lettings_log.rb b/spec/factories/lettings_log.rb
index b71362647..c85b4b00a 100644
--- a/spec/factories/lettings_log.rb
+++ b/spec/factories/lettings_log.rb
@@ -191,7 +191,7 @@ FactoryBot.define do
       discarded_at { Time.zone.now }
     end
     trait :imported do
-      old_id { rand(1...99_999) }
+      old_id { Random.hex }
     end
     created_at { Time.zone.today }
     updated_at { Time.zone.today }
diff --git a/spec/factories/sales_log.rb b/spec/factories/sales_log.rb
index 4835d738e..e930f3b2a 100644
--- a/spec/factories/sales_log.rb
+++ b/spec/factories/sales_log.rb
@@ -156,7 +156,7 @@ FactoryBot.define do
       discarded_at { Time.zone.now }
     end
     trait :imported do
-      old_id { rand(1...99_999) }
+      old_id { Random.hex }
     end
   end
 end